networking problem


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ive been running mandrake 8.2 for a while now, and i was using the net quite succesfully when we had a shared (over a lan of 6 computers) dial up 56k, it was all linked up to a hub and then toa server computer

we recently switched to adsl, got a router, hardware firewall and new hub, the system now is

6 computers -> hub ->router/hardware firewall

now i am unable to connect to the internet :( ive been through, set all the ips correctly, or so i thought :no: :angry:

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I might have to set up "port forwarding". Maybe port 80 or something isn't mapped right or something. I'm not too good with routers, but that might be one of the cases. I have to do port forwarding for some of my apps to work in the internet with my Linksys Router for my Cable connection.

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the router is forwarding the packets, atleast it is for the windows machines and the macs, does linux use a different header format, i doubt it would, as it is using the tcp/ip protocol, would opening a specific port on the router specifically for linux use work? i have full admin 2 the router, so yeh, thx 4 the help so far :)

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Is the router running a dhcp server to dish out ips and dns info to your machines or is it all setup manually?

Yes, most router will do that. It will pick up that IP change by automatic. All you have to do are put the static LAN IP on your machines and ISP's DNS too.

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i was thinking about the problem at work 2day, and i think i might have solved it, i havent implemented my changes as of yet, so yeh, tell me what you think:

because our router is running dhcp, it automatically assigns ips to the computers connected to it, i think the problem may be the fact that on my linux box, i told it that it was 192.168.0.3 (its ip before we got the router), the 2 problems i see with this is:

1) the ip i set on my linux box is different to the one assigned by the router

2) when i send out requests to the router for webpages etc, it sees 192.168.0.3 as being the sender, so it retrives the info, and forwards it to the computer that 192.168.0.3 is assigned to (a computer other than my linux box), as the REAL 192.168.0.3 did not send out requests to the router for this info, the packets are discarded, and my linux box isnt sent the packets, so it returns not connected to internet

does it sound to anyone like it is the problem thats been bugging me???

dude, i just realized, i halfway blind spoofed my router without knowing it :p cool :D

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